Alicia Keys and Kendrick Lamar perform their collab "It's On Again" for the first time ever on Jimmy Fallon.

Continuing their promo run for the new "Amazing Spiderman 2" soundtrack, Alicia Keys and Kendrick Lamar decided to stop by "The Tonight Show With Jimmy Fallon" on Friday night and perform their new collab “It’s On Again”. As usual, Kendrick rips his rhymes in impressive fashion and Alicia murders her vocals from the piano.

However unlike Future’s “Move that Dope” performance from Wednesday night, the Roots weren’t able to help with the background instrumentals-- though acclaimed film composer Hans Zimmer (who is helming the movie's score, and co-wrote the song), former-Smiths guitarist Johnny Marr, and MPC abuser AraaabMuzik filled the void quite nicely.

A super clean and dope performance here fam. Check it out and cop the soundtrack on iTunes now!